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Extinction type polyester resin for HAA system as well as preparation method and application thereof

A polyester resin, matte technology, used in polyester coatings, coatings, powder coatings, etc., can solve the problems of low-coating, low-light powder coating preparation, and high gloss of coating surface

Inactive Publication Date: 2019-11-22
HUANGSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high functionality of the HAA curing agent, its curing activity is high, the curing speed is fast, and the curing degree is uniform, but its defects tend to cause high gloss on the surface of the coating film, and it is difficult to obtain low gloss (<20 %) coating film, which is not conducive to the preparation of matte powder coatings

Method used

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  • Extinction type polyester resin for HAA system as well as preparation method and application thereof
  • Extinction type polyester resin for HAA system as well as preparation method and application thereof
  • Extinction type polyester resin for HAA system as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The matting type polyester resin for the HAA system described in this embodiment, based on the total amount of the polyester resin, its preparation raw materials include the following molar amounts of raw material components:

[0027]

[0028] The method for preparing the delustering type polyester resin for the HAA system in this embodiment comprises the following steps:

[0029] (1) Mix the 2-amino-4,6-dihydroxypyrimidine, neopentyl glycol, 1,10-decanediol and diacetone-D-mannitol in a selected amount, and control the temperature below 135 ℃ for heating and melting;

[0030] (2) Add a selected amount of terephthalic acid and tetrahydrophthalic acid to the above mixed material, and add a selected amount of catalyst, and rapidly heat up to 200-210°C within 2 hours under the protection of nitrogen to carry out insulation reaction ; Then gradually increase the temperature until no obvious distillate is distilled out, and the acid value of the reactant is less than 25m...

Embodiment 2

[0035] The matting type polyester resin for the HAA system described in this embodiment, based on the total amount of the polyester resin, its preparation raw materials include the following molar amounts of raw material components:

[0036]

[0037] The preparation method of the matte polyester resin for the HAA system described in this example is the same as that in Example 1.

[0038] After testing, the appearance of the matte polyester resin prepared in this example is colorless and transparent particles, the acid value of the polyester resin is 30 mgKOH / g, and the softening point is 120°C.

Embodiment 3

[0040] The matting type polyester resin for the HAA system described in this embodiment, based on the total amount of the polyester resin, its preparation raw materials include the following molar amounts of raw material components:

[0041]

[0042] The preparation method of the matte polyester resin for the HAA system described in this example is the same as that in Example 1.

[0043] After testing, the appearance of the matte polyester resin prepared in this example is colorless and transparent particles, the acid value of the polyester resin is 34 mgKOH / g, and the softening point is 112°C.

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Abstract

The invention relates to extinction type polyester resin for an HAA system. Terephthalic acid, tetrahydrophthalic acid, 2-amino-4,6-dihydroxypyrimidine, neopentyl glycol, 1,10-decanediol, diacetone-D-mannitol, 1,4,5,8-naphthalenetetracarboxylic dianhydride, 5-methyl isophthalic acid and trimethyl citrate are adopted as raw materials. All the components are matched with one another and have a synergistic effect so that the molecular weight distribution of the finally obtained polyester resin is not uniform and polybasic acids for end capping are different in type, and therefore, when the polyester resin with different end-capping functional groups and HAA are cured, the reaction activity difference is large, the curing process cannot be synchronously carried out, the cured coating surface shrinks, and the surface gloss is effectively low. Experimental data show that when the prepared extinction type polyester resin is used for preparing extinction type powder coating of an HAA system, acoating film with the glossiness smaller than 15% can be obtained, and excellent comprehensive performance is achieved.

Description

technical field [0001] The invention belongs to the technical field of powder coatings, in particular to a matting type polyester resin for HAA systems, and further discloses its preparation method and its application for preparing HAA system powder coatings. Background technique [0002] Powder coating is a 100% solid powder that does not contain organic solvents. It is different from oil-based paints and water-based paints. It does not use solvent or water as a dispersion medium when coating, but uses air as a dispersion medium to evenly coat the workpiece. The surface is a new type of environmentally friendly paint that forms a special-purpose coating film after heating. Powder coating has the advantages of no VOC, environmental protection, energy saving, high construction efficiency and wide application range. With its advantages of economy, environmental protection, high efficiency and excellent performance, it is gradually replacing organic solvent-based coatings and h...

Claims

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Application Information

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IPC IPC(8): C08G63/685C09D167/02C09D5/03C09D7/63
CPCC08G63/6856C09D5/033C09D167/02C08K5/20
Inventor 王永垒李海云江蓉魏文静张雅文孙巧巧黄铭
Owner HUANGSHAN UNIV
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